Description 1. Personalized LED display like left/right/up ,windmill,diamond. It is very cool . 2. Built-in Li-ion battery that can be recharged by USB,3.7V 650mAh can work up to 10 hours continuously. 3. Coupled with easy mount on the remote control and taillight, you can mount the taillight on different bike models by adjusting fixing straps. 4. Strong night laser mode can be better for other road users to keep a safe distance from you. 5. Super Performance, this bike rear light is shockproof and waterproof, it functions well under any weather conditions, suitable for mountain bikes, road bicycles, dirt bicycles, hybrid bikes etc. Light power: 3.7V 650 mAH USB battery Remote control battery: 1xCR2032(included) Colour:Black Material:ABS Package Contents: 1 x Lamp 1 x Manual remote control 1 x USB charging cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.